Preparation of Graphene Nanoplatelets by Thermal Shock Combined with Ball Milling Methods for Fabricating Flame-Retardant Polymers

Tran, Vinh Quoc; Doan, Huong Thi Thanh; Nguyen, Nhiem T.; Cuong, Van

doi:10.1155/2019/5284160

Cited by 7 publications

(4 citation statements)

References 16 publications

(23 reference statements)

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“…The inherent C�C signals from aromatic rings and symmetric and asymmetric vibrations of carboxyl O�C−O groups are presented at 1400 and 1600 cm −1 . 13,36 In addition, C−H symmetrical and asymmetrical signals of the aromatic ring and lattice edge correspond at 2166 and 2014 cm −1 . Nonetheless, discernible amplification at 3746 and 1739 cm −1 , corresponding to the C�O and the O−H vibrations, emerges.…”

Section: Resultsmentioning

confidence: 99%

“…Figure delineates the FTIR spectra comparisons between Ag/GNPs and GNPs and Ag/rGO and rGO. The GNPs FTIR spectrum exhibits very weak vibrational bands attributed to the CC bond of the aromatic ring at 1439 and 1565 cm –1 (Figure a) . Similarly, weak signals present at 2164 and 2012 cm –1 are attributed to the symmetrical and asymmetrical C–H bonds at the terminal edges of the GNPs’ carbon lattices. − Moreover, the vibrational band corresponding to the O–H bond of defects within the GNPs’ carbon network is scarcely discernible, making its appearance around 3712 cm –1 .…”

Section: Resultsmentioning

confidence: 99%

“… 31 Similarly, weak signals present at 2164 and 2012 cm –1 are attributed to the symmetrical and asymmetrical C–H bonds at the terminal edges of the GNPs’ carbon lattices. 31 − 33 Moreover, the vibrational band corresponding to the O–H bond of defects within the GNPs’ carbon network is scarcely discernible, making its appearance around 3712 cm –1 . 34 Typically, FTIR signals stemming from graphitic-structured carbon are inherently weak.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Ag-NP-Decorated Carbon Nanostructures: Synthesis, Characterization, and Antimicrobial Properties

Siller-Ceniceros,

Almonte-Flores,

Sánchez-Castro

et al. 2024

ACS Omega

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As the global urgency for effective antimicrobial agents intensifies, this work harnesses the widely demonstrated antimicrobial activity of silver nanoparticles (Ag-NPs) and proposes alternative synthesis approaches to metal−organic hybrid systems with antimicrobial activity. In this study, the proposed synthesis route involves decorating metallic nanoparticles into organic substrates without previous doping. The synthesis simultaneously uses polyethylene glycol for three crucial purposes: (1) acting as a mild reducing agent to generate Ag-NPs with a spherical shape and diameters ranging from 10 to just over 20 nm, (2) functioning as a dispersing agent for flakes of commercial nanostructured carbon supports, including reduced graphene oxide (rGO, ID-nano), and commercial carbon nanoplatelets from Sigma-Aldrich (GNPs, Sigma-Aldrich), and (3) serving as a promoter for the homogeneous anchoring of Ag-NPs in the carbon lattice without altering the conformation of the carbon lattice. This intricate interaction involves the π-orbitals from the sp 2 hybridization honeycomb and the d-orbitals from the Ag-NPs, leading to the constructive rehybridization of rGO and GNPs. In our study, Ag-NPs/rGO are compared with a support lacking oxygenated groups in the lattice, such as commercial GNPs (Sigma-Aldrich), to produce Ag-NPs/GNPs. This comparison maintains constructive sp 2 rehybridization, preserving the characteristic properties of rGO (ID-nano) and graphene nanoplatelets, including commercial GNPs (Sigma-Aldrich). Notably, oxygenated groups from rGO exhibit greater availability for exchanging oxo and hydroxy defects for Ag-NPs compared with GNPs (Sigma-Aldrich). The resulting Ag-NPs/rGO and Ag-NPs/GNP systems are thoroughly physicochemically characterized, employing techniques such as Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscopy, revealing the successful integration of Ag-NPs with minimal alteration to the carbon lattice. Subsequent antimicrobial evaluation against Escherichia coli (E. coli) demonstrates significant activity, with Ag-NPs/rGO and Ag-NPs/GNPs registering similar minimum inhibitory concentrations of 50 μg mL −1 . This study underscores the potential of our metal−organic hybrid systems as antimicrobial agents and provides insights into the constructive rehybridization process, paving the way for diverse applications in the biomedical and environmental fields.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Ag-NP-Decorated Carbon Nanostructures: Synthesis, Characterization, and Antimicrobial Properties

Siller-Ceniceros,

Almonte-Flores,

Sánchez-Castro

et al. 2024

ACS Omega

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“…For the efficient exfoliation of graphite, a combination of ball milling and other techniques has been proposed, such as ball milling coupled with ultrasonication, reported by Wang et al [ 82 ], thermal shock combined with the ball milling method [ 83 ], and a combination of the ball milling and microwave-assisted methods [ 84 ]. Moreover, to meet the goal of sustainable development, various green and biobased materials have been applied to assist the ball milling-induced exfoliation of graphite, such as waste fish deoxyribonucleic acid and Acacia mangium tannin (AMT) [ 80 , 85 ].…”

Section: Ball Milling-assisted Fabrication Of Flame Retardantsmentioning

confidence: 99%

Facile Ball Milling Preparation of Flame-Retardant Polymer Materials: An Overview

et al. 2023

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To meet the growing needs of public safety and sustainable development, it is highly desirable to develop flame-retardant polymer materials using a facile and low-cost method. Although conventional solution chemical synthesis has proven to be an efficient way of developing flame retardants, it often requires organic solvents and a complicated separation process. In this review, we summarize the progress made in utilizing simple ball milling (an important type of mechanochemical approach) to fabricate flame retardants and flame-retardant polymer composites. To elaborate, we first present a basic introduction to ball milling, and its crushing, exfoliating, modifying, and reacting actions, as used in the development of high-performance flame retardants. Then, we report the mixing action of ball milling, as used in the preparation of flame-retardant polymer composites, especially in the formation of multifunctional segregated structures. Hopefully, this review will provide a reference for the study of developing flame-retardant polymer materials in a facile and feasible way.

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Cu-Graphene water-based hybrid nanofluids: synthesis, stability, thermophysical characterization, and figure of merit analysis

Shaik,

Chakraborty,

Saboor

et al. 2024

J Therm Anal Calorim

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Hybrid nanofluids are emerging as an alternative to conventional heat transfer fluids and nanofluids for improving the thermal efficiency of heat exchanging devices synergistically due to their outstanding thermophysical properties associated because of the dispersion of different types of nanoparticles as compared to mono nanofluids. This will help in optimizing fluid characteristics in different flow regimes for several applications. However, enhancing the thermal energy efficiency of heat exchangers is challenging owing to the deprived stability of hybrid nanofluids at greater volume concentrations. This work concentrated on the synthesizing, thermophysical depiction, and thermal performance estimation of stable water-based Cu-graphene hybrid nanofluids using very low volume concentrations of Cu and graphene hybrid nanostructures. Cu-graphene hybrid nanofluid was successfully synthesized by dispersing the synthesized Cu and graphene nanostructures (keeping the Cu concentration constant at 0.04 vol % and varying the graphene concentration from 0.01 to 0.1 vol %) in water. Hybrid nanofluids display excellent stability against aggregation for up to 7 weeks, as proven by higher zeta potential values. Thermophysical characteristics of the prepared hybrid nanofluids were effectively measured. The thermal conductivity of Cu-graphene hybrid nanofluids shows exceptional enrichment (~ 35%) at minimal concentrations of hybrid nanostructures. Viscosity of the water-based hybrid nanofluids shows remarkable enhancement as compared to water and represents the increasing trend in viscosity of the base fluid with respect to the increase in concentration of hybrid nanostructures. The thermal and rheological properties of hybrid nanofluids are effectively validated with existing theoretical models. In addition, the specific heat and pumping power of Cu-graphene hybrid nanofluids with respect to the volume concentration of hybrid nanostructures are calculated using the existing theoretical equations. A figure of merit (FOM) analysis was conducted for the synthesized hybrid nanofluids to gauge thermal efficiency and evaluate the applicability of these hybrid nanofluids under laminar and turbulent flow conditions.

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Preparation of Graphene Nanoplatelets by Thermal Shock Combined with Ball Milling Methods for Fabricating Flame-Retardant Polymers

Cited by 7 publications

References 16 publications

Ag-NP-Decorated Carbon Nanostructures: Synthesis, Characterization, and Antimicrobial Properties

Ag-NP-Decorated Carbon Nanostructures: Synthesis, Characterization, and Antimicrobial Properties

Facile Ball Milling Preparation of Flame-Retardant Polymer Materials: An Overview

Cu-Graphene water-based hybrid nanofluids: synthesis, stability, thermophysical characterization, and figure of merit analysis

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